---
categories: Graph theory
---

## Problems
- [Cactus](https://open.kattis.com/problems/cactus)
- [Winter Festival](https://open.kattis.com/problems/winterfestival)

## See also
- [Depth-first search tree]()

## External links
- [Cactus graph](https://en.wikipedia.org/wiki/Cactus_graph)
- [[Tutorial] The DFS tree and its applications: how I found out I really didn't understand bridges](https://codeforces.com/blog/entry/68138)